Net::Telnet::Netscreen is mostly a pure rippoff of Net::Telnet::Cisco,
with adaptations to make it work on the Netscreen firewalls.
It also has some additional commands,
but for basic functionality,
see Net::Telnet and Net::Telnet::Cisco documentation.

Before you use Net::Telnet::Netscreen,
you should probably have a good understanding of Net::Telnet,
so perldoc Net::Telnet first,
and then come back to Net::Telnet::Netscreen to see where the improvements are.

Some things are easier to accomplish with Net::SNMP.
SNMP has three advantages: it's faster,
handles errors better,
and doesn't use any vtys on the router.
SNMP does have some limitations,
so for anything you can't accomplish with SNMP,
there's Net::Telnet::Netscreen.

Enter a virtual system in the firewall.
parameter is system you want to enter .
You may enter another vsys even if you are in a vsys.
Note that we will save your changes for you if you do.
(only works for ns-500+)